Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, yet the description adds genuinely non-obvious behavior: out-of-range pages return a normal result with an empty products list instead of an error. That pagination semantics detail is exactly the kind of context that prevents an agent from misreading an empty page as a failure; it does not, however, cover rate limits or category-validation behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three tight sentences, front-loaded with the core action and return shape, then the required-parameter semantics, then the pagination edge case. No filler, and each sentence adds information an agent would otherwise lack.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return-value documentation is not required, and the safety profile is covered by annotations. The remaining gaps are the undocumented sort/page_size/is_new parameters and no note on invalid category slugs, but for a read-only listing tool this is close to complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description carries the burden. It does well for category_id (explicitly a slug, with three concrete examples) and page (page-based, saturating rather than erroring), but sort, page_size, and is_new are left entirely unexplained despite being 3 of the 5 parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource: browsing an H&M category's product listing, and enumerates the returned fields (pricing, images, colors, per-size stock). It is clearly a category-browse tool, but it never names or contrasts with siblings like hm_search or hm_product, so the boundary is inferred rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied: the tool takes a category slug, so an agent infers it should be used after resolving a category (e.g. via hm_categories) rather than for keyword search. There is no explicit when-to-use vs when-to-use-an-alternative guidance, and no mention that hm_search covers free-text queries.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.